Slide valve for the scavenging air pump and for the starting air in internal-combustion engines



Aug. 12, 1930.

STARTING AIR IN INTERNAL COMBUSTION EN E. O. P. THEGE SLIDE VALVE FOR THE SGAVE'NGING AIR PUMP AND FOR THE Filed Juhe 21 1926 GINES 4 Sheets-Sheet 1 g- 12, 0- o. P. THEGE 7 7 THE SCAVENGING AIR PUMP AND FOR THE R IN INTERNAL COMBUSTION ENGINES Fi led June 21 SLIDE VALVE FOR STARTING AI 1926 '4 Sheets-Sheet 2 Big? 8- 2, 1930. E. o. P. THEGE 1,772,970

vSLIDE VALVE FOR THE SCAVENGING AIR PUMP AND FOR PHE STARTING AIR IN INTERNAL QOMBUS'EION ENGINES Filed June 21, 1926 4 Sheets-Sheet 3 IIIIIIIIIIIIIIIIIIIIIII v-flljaye g- E. o. P. THEGE SLIDE VALVE FOR THE SCAVENGING AIR PUMP AND FOR THE STARTING AIR IN INTERNAL COMBUSTTONENGINES' Filed June 21 1926 4 Sheets-Sheet 4 54 aha 7Q Patented Aug. 12, 1930 STATES; eAraNr c er cs EDVIN' OSSIAN', PARCIVAL THEGE, F STOCKHOLM, SWEDEN, ASSIGIWOJR, T 0. AKTIE- BOLAGET ATLAS DIESEL, OE STQCKHOLM, SWEDEN,

SLIDE VALVE non THE soevnnenqe are PUMIE, m Eon 'rnn s'ran'rme am In TE N L- MB ST N ENe Es.

Application filed June 2;, 1926, se ial No. 117,551, and in Sweden July 7, 1925.

of the scavenging air to the scavenging air conduit or the so called receiver, common to the difi erentcylinders, and control the start ing air. For the said purpose'the invention.

comprises a slideevalve, which is'so arranged,

that it is able to perform both thesaid func-' tions. In order to render this possible the slide-valve is shifta ble into two different functioning positions. In one of the said positions the said slide-valve controls the passage of theair to the scavenging air pump and from the same and in the' other position it controls the passage of the air 'fromthe receptacle containing compressed air'for the starting of the engine. l/Vith' the slide-valve a valve device may 'be"combined which controls the passage of the scavenging air from the said receivertothe working cylinders respectively. i 1

Fig. 1 in the accompanying drawings isa vertical section of a two stroke cycle engine;

only so much of the engine is shown as'is, necessary for explaming the invention. Fig

2 shows in a horizontal section a mechanism for shifting a crank, actuating the slidevalve, through an angle of 180 as the rotary direction of the engine is reversed.

Fig. 3. is a vertical sectlon of the sllde-valve mechanismon a larger scale, the'section of r the lower part being taken along the line 3-3,

l which is rotated by a shaft 55 through'a mechof Fig.

Fig. 4; is a section on the line 4.-4 of Fig. 3; Figs. 5. and 6 are sections on the lines 5+5 and 66, respectively, of Fig. 3 andshowing the slide-valve in position for controlling the passage of the air to the scavenging air pump and then to the receiver;

Figs. 7 and8 are sections of the slide-valve on the lines 77 and 8-8, respectively, of

Fig. 3 and showingthe slide-valve in position for controlling the passage of the starting air to and from the working cylinder;

Fig. 9 is a side view partiallyjshowing a vertical section of a part of the engine; "and Fig, .10 i adetailin side view.

It. is presumed that the engine is a multicylinder engine provided with a receiver 1 for the scavenging air. 2 is one of the working cylinders with the piston 3, the admission port 4 for the scavenging air and the exhaust through'a valve may be connected with a receptacle for the starting air of the engine (said valve andreceptacle are not shown in the drawings). starting air, which in the engine shown in the drawings communicates with a chamber which is provided round the cylinder/2 and from which the air then passes to the open air through a pipe 6. i

In order now to conduct air for; the scavenging of the cylinderlto the lower part of the cylinder 2 and from the said part to the receiver, as well as the starting air to the cylinder and from the cylinder to the dischargeport for the air,'the engine is provided with a slide-valve, which in the form of execution shown in the drawings consists of a cylindrical slide 9, turnable and slidable in the lining 10 of a casing 11. The said slide-velvet) is moved upwards and downwards by a crank '12, provided on a shaft 12 anism, shown in'Fig. 2 and described more fully hereinafter. The saidshaift 55is rotated by the main shaft 56 of theengine, Fig. 9, and by means of a spur gearing of the well known construction and enclosed in a casing 57, one of the-toothed wheels 58 is shown in 2. A pitman 13, connected'with ahead on the spindle 16 of the s1ide-valve'9 transmits motion from the side crank 12. Spindle 16 is fixed to the head 15* in a rotata-' ble manner and the head 15 slides in a guide 15, while the spindle 16 slides in a tightening sleeve 14. Spindle 16 is fixed to the slide valve 9 by means of its screw-threaded end 8 is a discharge port for the and a nut. The central part 17 of the slidevalve 9 is cylindrical or constitutes in any other manner a passage, which extends through the slide-valve and connects the chamber below the slide-valve with the chamber above the slidevalve. The chamber last mentioned communicates directly with the receiver 1. Owing to the described arrangement the slide-valve is balanced, so that the pressure in the receiver 1, does not afford any resistance against the moving of the slidevalve. Slide-valve 9 can be rotated into two different functioning positions by means of an arm 18 to which the spindle 16 is slidably but not rotatably connected for instance by the said arm engaging a square portion 19 of the spindle. The shifting of the arm 18 and thereby the turning of the slide-valve may be effected by any suitable means. The mechanism ought, however, be so arranged, that the slide-valve 9 is turned into the functioning position in which it controls the starting air before the admission valve for the said air is opened.

The slide valve 9 and the lining 10 are provided with a number of co-operating openings. The openings of the slide-valve are divided into two sets, one set located above a transverse partition wall 20, which together with the outer wall, the inner central wall 17 and the end walls 21 of the slid evalve enclose two chambers 22 and 23 in the slide-valve.

The lower chamber 23 is put into communication during each upward stroke of the piston 3 through openings 24: and 25 in the slidevalve with openings 26 and 27 provided in the lining 10 and thus with the channel 6. At the starting position of the arm 18, shown in Figs. 7 and 8, the said chamber 23 communicates through openings 25 in the slidevalve 10 uninterruptedly with openings 38 provided in the lining 10 and leading from the admission port 7. While the arm 18 is in the position shown in Figs. 5 and 6 and corresponding to the running of the engine, the said chamber 23 communicates uninterruptedly through openings 28 in the slidevalve and openings 29 in the lining 10 and openings 30 in the casing 11 with the atmosphericair; During each downward stroke of the piston 3 the upper chamber 22 is put into communication through "openingsee" and33 in the slide-valve 9 with openings 26 and 31 in the lining 10 and thus channel At the starting position of the arm 18 the said chamber 22 communicates uninterrupt edly'through'openings 34 in the slide valve with openings 39 provided in the lining and leading to the discharge port 8, and as the arm 18 is in the position corresponding to the running of the engine, chamber 22 co1innunicates through the openings 3 1 uninterruptedly with openings 35 provided in the lining 10- andleading to a passage 36 provided in the casing 11 and communicating through a tube 37 with the receiver 1.

For the starting of the engine the slidevalve is turned into such a position, that the parts of its mantle wall, located between the openings 28 and 3 1 respectively cover the openings 29 and 35 in the lining 10, and the openings 25 and 3-1 uncover the openings 38 and 39 respectively. After the valve, controlling the admission port 7 for the compressed air, has been opened, compressed air passes, while the slide-valve 9 is moved up wards, through port 7, openings 38 and 25 into the chamber 23 and from the chamber 23 through the openings 25 and 2 1 of the slide-valve and the openings 26 and 27 and. channel 6 into the cylinder chamber, located below the piston 3, and forces the piston upwards, said piston being at present in its lowermost position. As the piston has arrived at its uppermost position. slide 9 covers the openings 26 and 27, while its openings 32 and 33 uncover'the openings 26 and 31. so that air passes from the bottom part of the cylinder 2 through channel 6, openings 26 and 31 in the lining 10 and openings 32 and 33 into the chamber 22 and from the latter through openings 34 and 39, port 8, chamber surrounding the cylinder 2 and pipe 6 to the atmospheric air. As the piston 3 then arrives at itslowermost position. the communication between the bottom chamber of the cylinder 2 and the port 8 is again interrupted and the said chamber put into communication with the port 7 After the en gine has been started the slide-valve 9 is turned by means of the arm 18 into the position shown in Figs. 5 and 6 and correspondingto the running of the engine, in which position the openings 38 ad 39 are covered by the parts of the mantle wall of the slidevalve which are located between the openings 25 and 34 respectively.

If new the crank 12 is rotated in the direction indicated by the arrow in Fig. 1 and consequently the slide-valve is moved upwards, the slide valve puts the chamber 23, which communicates with the atmospheric air through the openings 28, 29 and port 30 into communication with the channel 6 and the lower part of the cylinder 2 through the openings 24- and 25 in the slide-valve 9 and the openings 26' and 2731mm lining 10." in consequence hereof air is sucked into the lower part of the cylinder 2, as the piston 3 moves upwards from its lowermost position, shown in Fig. 1. During the subsequent working stroke of the piston 3 the slide-valve 9 covers the openings 26 and 27, while its openings 32 and 33 uncover the openings 26 and '31. Consequently the air contained by the lower part of the cylinder 2 is forced by the piston 3 through the openings 26 and 31 of the lining and the openings 32 and 33 of the slide-valve and into the chamber 22, from which the air passes through Openings 34 channel 36 and tub'e'37 into the reinay be coupledto a special slide-valve for controlling the admission of the seai 'enging air intothe working Cylinder. In this manner both the slide-valves are moved by the same crank or the like. Figs. 1, 3 and 4 show a slidevalve 40 the spindle 41 of which is connected in a rotatable manner with a disk 42 fixed to the slide-Valve 9 by means of screws. The slide-valve 40 is provided with openings 44 cooperating with openings 45 in a lining 46, which is surrounded by a chamber 43*, communicating with a passage 43 leading to the port 4 of the cylinder 2. As the piston 3 during its working stroke uncovers the port 4, the slide-valve 40 still covers the opening 45 and does not uncover the same until the piston has uncovered also the 6X haust port and expansion has taken place in the cylinder 2. Compressed air then enters the top part of the cylinder 2 and scavenging is elfected. Piston 3 then covers the port 4, and the slide-valve is brought into its closed position. The mantle wall of the slide-valve 40 is fixed to the hub of the slidevalve by means of arms 40 and the openings 44 and 45 have such a length peripherally, that, even if the slide-valve 40 is rotated with the slide-valve 9 the openings 44 and 45 will always constitute an ample passage for the compressed air, as the slide 40 is moved into its upper position.

For the reversing of the rotary direction of the engine, crank 12 is shifted through an angle of 180. The mechanism for effecting the said shifting is shown in Figs. 2 and 10 and comprises a sleeve 47 which is slidably but not rotatably connected with the shaft 12 of the crank 12 by means of key and slot. The said sleeve 47 has a peripheral groove 48 which is engaged by an arm 49, slidable on a stationary rod 50 which is parallel tothe shaft 12*. Arm 49 together with the sleeve 47 may be shifted manually, pneumatically or in any suitable manner by means of a rod 51 fixed to the arm 49. Screw-shaped grooves 52 provided in the sleeve 47 are engaged by pins 53 provided with rollers and fixed to the second sleeve 54. Said sleeve 54 is fixed to a I shaft 55, which is rotated by the main shaft in the manner stated above. tation sleeve 54 carries with itself sleeve 47 pins 53 with'the grooves 52. As the sleeve 47 lines to the position shown by dotted lines and vice versa grooves 52 cooperating with the pins 53 impart to the sleeve 47 and thus to the shaft 12 and the crank 12 a rotary motion equal to 180 or the angle necessary for the reversing of the rotary direction of the engine.

Sit-111G 50 ing air.

During its ropassage respectively, slide valveandthe' lining being so located,

V I claim:

L A valve-device for multi-cylinder engines ofthe two-stroke systeni,-provided with a conduit for scavenging air common to the cylinders and with a pump compressing the said air, said valvedevice comprising a slidevalve, means for adjusting the slidevaive into two functioning positions,'ineans for operating the slide-valve in each of the said functioning positions, said slide-valve 'liaving openings co-operatingwithopenings provided in the lining of'th'e slide-valve casing and communicating with the said pump and conduit, a starting air inlet and a discharge passage respectively, the openings of the slide valve and the lining being 'so'located, that the slide-valve when operated in its onefunctioning position conducts air'to the pumpland -fr'om'the same to the conduit forthe scavenging air'and when operated in its other functioning POSltIOiICOHClUCfiS starting airto tlie'piston of'the said pump and from the 2. A valve device for"inulti-cylinder';engines of the two-stroke system, provided with a conduit for soavenging'air common to thecylinders and with a-pump'conipress ing the'said air, said valve device comprising a cylindrical slide, a transverse partition wall dividingthesli'de into two chambers, said slide and thelinin'g of the slide valve casing having openings, the openings of the lining communicating with thesaid pump and con duit, a starting air inlet 'anda"discharge passage respectively, means for 'rotatingthe slide nto "two functioning positions, and

meansfor'operatiiig the slide in each of the said functioning positions, the openings of thev'alve'and the lining being so located, that the chambers in oneof the functioning positions of the-sli'de-valve control'thepassage of air to thesaidpump'which is constituted by the chamber-below the'piston of the en- 'giii'e, and from thepump to'the conduitfor the "scavenging air, and in the other funct oningpos'ition ofthe slide-valve controls the passage of starting 'air'to' the said pump and from the'la'tt'er to the discharge passage forthe'said air.

3, A valve "device for multi cylinder engines of the two-stroke system, provided with a conduit'forscavenging aircommon to the cylinders and with a pump compressingthe F "said air, sa d valve device comprising a slideand shaft 12 owing to engagement or the valve, means foradju'sting the slide-valve "into two functionin ypositions means for is moved from the position shown by full b vided'in' the lining of the slide valve casing, and communicating withthe said pump and conduit, a starting air inlet and a discharge the openings of the the discharge passage forthe startthat the slide-valve when operated in its one functioning position conducts air to the said pump and from the same to the conduit for the scavenging air, and when operated in its other functioning position conducts starting air to the piston of the pump and from the same to the discharge passage for the starting air, and a longitudinal channel pro vided in the slide-valve and connecting a chamber located in the slide-valve casing at the one end of the slide-valve with a chamber in the said casing located at the other end of the slide-valve and communicating with the conduit of the scavenging air, whereby the slide valve is balanced.

4. A valve device for multi-cylinder engines of the two-stroke system, provided with a conduit for scavenging air common to the cylinders, and with a pump compressing the said air, said valve device comprising a slidevalve, means for adjusting the slide-valve into two functioning positions, means for operating the slide-valve in each of the said functioning positions, said slide-valve having openings co-operating with openings provided in the lining of the slide-valve casing, and communicating with the said pump and conduit, a starting air inlet and a discharge passage respectively, the said openings of the slide-valve and the lining being so located, that the slide valve, when operated in its one functioning position conducts air to the said pump and from the same to the conduit for the scavenging air, and when 0perated in its other functioning position conducts starting air to the piston of said pump and from the same to the discharge passage for the starting air, a slide controlling the passage of the scavenging air from the said conduit to the working cylinder, and means connecting the said slide with the said slidevalve, whereby the slide and slide-valve are operated by the same means.

5. A valve-device for multi-cylinder engines of the two-stroke system, provided with a conduit for scavenging air common to the cylinders and with a pump compressing the said air, said valve device comprising a slidevalve, means for adjusting the slide-valve into two functioning positions, an eccentric device for operating the slide-valve in each of the said functioning positions, said slidevalve having openings co-operating with openings providedin the lining of the slidevalve casing and communicating with the said pump and conduit, a starting air inlet and a discharge passage respectively, the openings of the slide-valve and the lining being so located, that the slide-valve when operated in its one functioning position conducts air to the said pump and from the same to the conduit for the scavenging air, and when operated in its other functioning position conducts starting air to the piston of the said pump and from the same to the discharge passage of the starting air, and means for changing the angular position of the said eccentric device for the reversing of the rotary direction of the engine.

In testimony whereof I have hereunto atfixed my signature.

EDVIN OSSlAN PARCIVAL THEGE. 

